CLADOENDESIS OF EPHEMEROPTERA
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CLADOENDESIS OF EPHEMEROPTERA |
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Stenacron
(Panephemeroptera
Euephemeroptera
Euplectoptera
Anteritorna
Bidentiseta
Branchitergaliae
Heptagennota
Pentamerotarsata
Radulapalpata
Heptagenia/f5=g4Ecdyonurus/fg1Heptagenia/f6=g5KageroniaHeptagenia/f7=g6
Stenonema/fg1
-
Stenacron)
Nomen hierarchicum:
Stenacron/g(1)
[g:1974]
In circumscription fits:
— grex spp. interpunctata: Spieth 1933: 332
— grex spp. interpunctatum: Traver 1933: 173
— subgen. Stenacron: Kluge 1983b: 16 (Abstract)
— gen. Stenacron Jensen 1974: 225
— Stenacron/g(1): Kluge 2004: 173
References.
Spieth 1933: 
*; – Spieth 1947: 
*
* *; – Koss 1968:
*; –
Jensen 1974: * *; – Edmunds & Jensen & Berner 1976:
* *;
– Kluge 2004: * *
* *.
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Autapomorphy of Stenacron. (1) Egg, instead of usual knob-terminated threads [see Branchitergaliae (4)], bears on each pole a ring formed by very long coiled threads, that looks as a polar cap (Koss 1968: Fig.16). Similar structure occurs in some Furcatergaliae only (see Index of characters [3.6]). Character of Stenacron of unclear phylogenetic status. (2) All tergalii I–VII have stretched pointed apices, and tergalii I–VI [which have long anal rib – see Stenonema/fg1 (2)] have this pointed apex somewhat curved anteriorly (Kluge 2004: Fig.56:O). In all other Stenonema/fg1 tergalii I–VI are not pointed. Plesiomorphy of Stenacron. Unlike Macdunnoa, tergalii VII [thin and lacking fibrillose portion – see Stenonema/fg1 (3)] are not shortened. |
Size. Fore wing length 8–12 mm.
Distribution. Eastern Nearctic.
Nominal species in Stenacron/g(1):
affine Traver 1933 [Stenonema]
— syn.subj. interpunctata [Baetis]
areion
Burks 1953 [Stenonema]
— syn.subj. interpunctata [Baetis]
canadensis Walker 1853 [Baetis]
— syn.subj. interpunctata [Baetis]
candidum Traver (in Needham
& Traver & Hsu) 1935 [Stenonema]
carolina
Banks 1914 [Heptagenia]
conjunctum
Traver (in Needham
& Traver & Hsu) 1935 [Stenonema]
— syn.subj. interpunctata [Baetis]
floridense Lewis 1974 [Stenonema]
frontale Banks 1910 [Heptagenia]
— syn.subj. interpunctata [Baetis]
gildersleevei Traver (in Needham
& Traver & Hsu) 1935
[Stenonema]
heterotarsalis McDunnough
1933 [Ecdyonurus]
— syn.subj. interpunctata [Baetis]
interpunctata Say 1839 [Baetis]
— typus nominis Stenacron
,,/
majus Traver (in Needham
& Traver & Hsu) 1935 [Stenonema]
— syn.subj. interpunctata
[Baetis]
minnetonka Daggy 1945 [Stenonema]
ohioense
Traver (in Needham
& Traver & Hsu) 1935 [Stenonema]
— syn.subj. interpunctata [Baetis]
pallidum Traver 1933 [Stenonema]
proximum Traver (in Needham
& Traver & Hsu) 1935 [Stenonema]
— syn.subj. interpunctata [Baetis]
See also:
Radulapalpata
INCERTAE SEDIS
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